Reamer sharpening jig



April 11, 1950 H. R. LENTZ 3,

REAMER SHARPENING JIG Filed March 1, 1947 4 mveu'roz #525527 16 law:

Patented Apr. 11, 1950 UNITED STATES TENT OFFICE 1 Claim. 1

This invention relates to improvements in sharpening jigs for reamers, and more particularly to a novel sharpening jig for reamers of a type capable of varied and fine adjustments.

An object of the invention is to provide a device of the type which will have means cooperating with the flutes of a reamer for positioning the same with reference to a grinding wheel for sharpening said reamer.

Another object of the invention is to provide a reamer sharpener which is relatively inexpensive in construction, and which is readily adapted for use in grinding reamers of various diameters, and which is readily adjustable to regulate the angle at which the reamer is sharpened.

Other and further objects of the invention will appear as the description proceeds, reference being had to the accompanying drawing, in which- Fig. 1 is a side view partly in section and partly in elevation of a reamer sharpening jig embodying my invention.

Fig. 2 is a plan view of the device.

Fig. 3 is a fragmentary detailed end view of the device partially cut away.

Fig. 4 is a view on line 44 of Fig. 1.

Referring more particularly to the drawing, the numeral 10 refers to the base of the device which is bored at the four corners as at H for the accommodation of fastening means such as screws or the like. The base I is provided with a vertical bolt I 2 which receive the nut 13 for securing the base portion 14 of the angle segment l having the vertical standard It slotted at H thereof. The horizontal portion l4 of the angle segment l5 has an arcuate and beveled edge at l8 thereof marked or inscribed with a scale to be read relatively to a zero mark at 19 on base 19.

A housing 20 is provided with the stud 2| which is extended through the transverse slot l1 and secured by the nut 22 which bears against the washer 23 and the ring 24 having a triangular indicator point 25. A collar 26 is interposed between the housing 20 and the standard [6 on the stud 2| and carries scale markings which can be read with reference to the indicator point 25. The housing 20 has a relatively large bore at 21 thereof which accommodates the bushing 28, held in place by the set screw 29 in a bore at 30 Of said housing. The bushing 28 is provided with a second bore adjacent its frontal portion at 3| thereof to slidingly receive the pin 32 which has a beveled lower end 33 and is apertured at 34 to accommodate the spring 35 which latter is anchored to the bushing 20 by screw 36. A guide 31 has a threaded shank 38 extended at an angle thereto and integral therewith. The said shank 3B is longitudinally slotted as at 39 to receive the guide 40 which is secured by means 4| to said housing 20. An internally threaded sleeve 42 is accommodated by the bore 43 of housing 20, and receives the threaded shank 33. The sleeve 42 has the integral knurled handle member 44 which is ringed by the tapered flange 45 which bears scale markings as at 46.

In use, a reamer tool 59 is placed within the bushing 28 so that one of its flutes 5i bears with its radial side against the straight side of the pin 32. Handle member 44 may be manipulated to dispose the guide 31 which bears against the lower end 52 of reamer 59, in order that said lower end will bear properly against the side of grinding wheel 53. The housing 29 may be adjusted about a horizontal axis by loosening and setting the nut 22. The entire jig may be adjusted about a vertical axis by loosening and setting of the nut 13. The sleeve 42 has a band groove at 55 thereof which is tapered to receive the tapered end 56 of the set screw 51 equipped with lock nut 58. The set screw 57 will thus slidingly secure the sleeve 42 against longitudinal movement within the bore 43 of housing 29.

It will be understood that the device is capable of many modifications in structure and design, without departing from the spirit of the invention, within the scope of the appended claim.

Having thus described my invention, what I claim and desire to secure by Letters Patent of the United States is:

A reamer sharpening jig comprising a base, a. standard thereon rotatable about a vertical axis, a housing on said standard adjustable on a horizontal axis, a tubular bushing in said housing for receiving said reamer, a pin slidably mounted in said bushing at right angles to the axis of the latter for engaging a flute of said reamer with a ratchet action, a yieldable spring for urging inward return of said pin when the reamer is rotated, a guide for engaging the lower end of the reamer to limit its downward projection from the bushing, and threaded means associated with the housing to adjust said guide.

HERBERT R. LENTZ.

REFERENCES CITED The following references are of record in the 

